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  • Semi-Crystalline Polymers  (1)
  • TMDSC  (1)
  • characterization  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Thermal and mechanical characterization of high performance epoxy systems with extended cure times (1996)
    Springer
    Journal of thermal analysis and calorimetry 46 (1996), S. 1511-1525 
    Details
    ISSN: 1572-8943
    Keywords: characterization ; epoxy ; extended cure time
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Five epoxy resins of different chemistry and functionality were cured with DDS (4,4′-diaminodiphenyl sulfone) using 2, 8 and 14 h curecycles. Both Differential Scanning Calorimetry (DSC) and Thermomechanical Analysis (TMA) were used to characterize reaction behavior and cured properties of the resin systems. In addition, static mechanical tests and density measurements were integrated with the thermal characterization methods to correlate resin properties with process time. Flexural three-point bending experiments showed that the resins tended to have higher yield stress and toughness values at extended cure times. The improved mechanical properties could be attributed to the full development of the epoxy molecular structure, in the form of cross-linked networks and molecular rearrangement. These results suggest that extended cure times or high temperature post-curing may be required to obtain the resin's ultimate mechanical properties for high performance composites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01980758
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  • 2
    Electronic Resource
    Electronic Resource
    Temperature-Modulated Differential Scanning Calorimetry through Heat Diffusion Analysis (1998)
    Springer
    Journal of thermal analysis and calorimetry 54 (1998), S. 501-519 
    Details
    ISSN: 1572-8943
    Keywords: complex heat capacity ; heat transfer ; phase lag ; TMDSC
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract In the present study, a complete model of thermal diffusion in a TMDSC specimen is presented. The governing equation takes into account thermal conductivity and does not neglect temperature gradients. This model is solved analytically for a specimen of cylindrical geometry with two surfaces following the block temperature and considering the third surface insulated. The full analytical solution consists of a transient and an asymptotic expression. The asymptotic expression is divided into an underlying and a cyclic part to allow comparison with existing models. The present model finds that the phase angle between the temperatures of sample and block are dependent upon the sample material, which has not been predicted by existing models. Moreover, the present model does not require the use of an experimentally determined constant as long as the cell is ideal. It was found that the phase lag between sample and block temperatures could be described by two effective thermal diffusivities, Λ′ and Λ″, instead of complex heat capacities $$c'_p {\text{ and }}c''_{\text{p}} $$ and $$c'_p {\text{ and }}c''_{\text{p}} $$ . These heat capacity parameters were viewed as mathematical artifacts arising from the use of an over-simplified governing equation that does not take into account thermal conductivity and thermal gradients within the specimen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010134307537
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  • 3
    Electronic Resource
    Electronic Resource
    The effect of a magnetic tape coating process on the structure and properties of a semi-crystalline polymer (1986)
    Springer
    Colloid & polymer science 264 (1986), S. 683-690 
    Details
    ISSN: 1435-1536
    Keywords: Semi-Crystalline Polymers ; orientation ; crystallinity ; magnetic coating ; processing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A combination of structure identifying and bulk property experiments were combined with a two-phase analytical methodology to elucidate the influence of a magnetic tape coating process on the substrate polymer film. Employing a typical tape manufacturing process that utilizes coating, drying, and calendering stages, polyethylenete-rephthalate polymer film samples with and without the magnetic coating were prepared. Experiments and modeling studies performed on these samples demonstrate that the drying and calendering processes may increase the crystallinity and noncrystalline orientation of the substrate film. In addition, dynamic mechanical experiments identified a viscoelastic transition at 50 °C for the PET substrate film sample which is near the glass transition of the magnetic coating utilized. Overall, the results of this investigation provide a basis for evaluating structure property interrelations of polymer-based magnetic tapes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01469529
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